The Unnamed (between Curtis Hills and Bruce Hills) is a lead, silver, and copper mine located in Alaska.
About the MRDS Data:
All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.
Mine Info
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Unnamed (between Curtis Hills and Bruce Hills) MRDS details
Site Name
Primary: Unnamed (between Curtis Hills and Bruce Hills)
Commodity
Primary: Lead
Primary: Silver
Primary: Copper
Secondary: Titanium
Secondary: Chromium
Secondary: Iron
Location
State: Alaska
District: Juneau
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant:
Physiography
Not available
Mineral Deposit Model
Not available
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Propylitic (?).
Rocks
Not available
Analytical Data
Not available
Materials
Gangue: Quartz
Gangue: Calcite
Gangue: Ankerite
Comments
Comment (Exploration): Status = Inactive
Comment (Deposit): Model Name = Distal low-sulfide quartz-carbonate veins: Possible trace element contribution from mafic dike hosts.
Comment (Deposit): Other Comments = the vein deposits are typical distal quartz-carbonate veins locally enriched in lead, copper, and silver. Prospecting closer to the granitic intrusives of the Bruce and Curtis Hills might find richer vein deposits, possibly transitional into copper and copper-molybdenum-bearing deposits.. The site is in Glacier Bay National Park and Preserve.
Comment (Geology): Geologic Description = The area is underlain by schist, hornfels, and marble derived mainly from sedimentary rocks of Paleozoic age. The sedimentary rocks were metamorphosed by the intrusion of a granitic batholith of Cretaceous age (Brew and others, 1978). The metasedimentary rocks are cut by mafic dikes and lie between the granitic Curtis and Bruce Hills. The area has recently been denuded by melting of the Plateau and Burroughs Glaciers. . The mineral occurrences of the area are mainly low-sulfide quartz-calcite-ankerite veins that formed on the contacts of mafic dikes that cut the metasedimentary rodk. Grab samples of various occurrences contained as much as 300 ppm lead, 700 ppm copper, and 15 ppm silver (MacKevett and others, 1971, location 23, table 9; Kimball and others, 1978, location 73, p. C316-317). Other elements, including chromium, iron, and titanium, are locally geochemically anomalous in the veins; these elements possibly were contained in or contributed to the veins by the mafic dikes. Titanium content exceeded 1 percent in one sample and was 1 percent in several others. Veins of the area could be distal structures to a buried contact zone between granite and the metasedimentary rocks.
Comment (Geology): Age = Cretaceous or younger.
Comment (Reference): Primary Reference = Kimball and others, 1978
Comment (Workings): Workings / Exploration = No workings. MacKevett and others (1971, location 23) found as much as 700 ppm copper and chromium and 1 percent titanium in iron-stained vein zones along mafic dikes. Kimball and others (1978, p. C316-317) reported 300 ppm lead and 15 ppm silver in a 0.3 foot thick quartz-calcite vein and more than 1 percent titanium in one wider (5 ft.) chip sample.
References
Reference (Deposit): Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources, in Brew, D. A., and others, Mineral resources of the Glacier Bay National Monument wilderness study area, Alaska: U.S. Geological Survey Open-File Report 78-494, p. C1-C375.
Reference (Deposit): Brew, D.A., Johnson, B.R., Grybeck, D., Griscom, A., Barnes, D.F., Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources of the Glacier Bay National Monument Wilderness Study Area, Alaska: U.S. Geological Survey Open-File Report 78-494, 670 p.
Reference (Deposit): MacKevett, E.M., Jr., Brew, D.A., Hawley, C.C., Huff, L.C., and Smith, J.G., 1971, Mineral resources of Glacier Bay National Monument, Alaska: U.S. Geological Survey Professional Paper 632, 90 p., 12 plates, scale 1:250,000.
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